Improvement in drills for drilling metal



J.SARGENT; Drills for Drilling metal,

N0, 155,337, Patented Sept. 22,1874.

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l THE GRA PH|C ca PHDTo-LITHAJSBI 4| PARK PLACLNM UNITED STATES PATENTOFFICE.

JAMES SARGENT, OF ROCHESTER, NEI/V YORK.

IMPROVEMENTIN DRILLS FOR DRILLING METAL.

Specication forming part of Letters Patent No. 155,337, dat( d September22, 1874; application filed June 2o, 1874.

To all whom it may concern:

Be it known that I, JAMES SARGENT, of the city of Rochester, in thecounty of Monroe and State of New York, have invented a certain new anduseful Improvement in Boring- Instruments; and I do hereby declare thatthe following is a full, clear, and exact description of theconstruction and operation of the same.

This invention relates to boring-tools, in which the boring-shaft iscapable of a rapid or slow revolution for the purpose of operating onmetal and wood.

The improvements are fully hereinafter described, and pointed out in theclaim.

In the drawings, Figure l is an elevation with a portion of the centerbearing broken away, showing my improvement. Fig. 2 is a centralvertical section. Figs. 3 and 4 are detail views. l

A represents the stock, and B the head, of the instrument, by which thepressure is applied in boring. O is a central chamber or bearing,connecting the stock A and the shank D, and serving to hold the gearingby which the instrument is driven. AIt may be either open or closed. lnthe latter case it has a cover or head, a, which turns on a stud, b, bymeans of the crank E, and carries on its inner side two cog-rims, 1 2,of unequal diameter, one within the other. IVith these cogrims engages abevel-pinion, 3, attached to the end of a shaft, G, which extendsthrough the hollow shank D, and carries at its outer end the tool H, bywhich the work is done.

The shaft slides endwise, so as to bring the pinion 3 in connection witheither of the cogrims, l 2. When engaged with the inner one the motionis slow, and when engaged with the outer one the motion is rapid. Thisis necessary to accommodate different kinds of work-as in boring wood oriron-or to adapt the motion to tools of different sizes or kinds.

The shaft G at its lower end has a shoulder, c, which rests against anadjusting-sleeve, d, which forms a part of the shank. The upper end ofthis sleeve rests loosely upon a bearing, j, of the fixed upper part ofthe shank. A stop, g, consisting of a screw or other device, passesthrough the sleeve, and enters a longitudinal slot, h, of the bearing f.At the upper and lower ends the slot has offsets h h at just such adistance apart as will allow the pinion 3 to slide to engage with therespective cog-rims l 2.

The shaft G, being' connected with the sleeve d, slides up and down withit to engage with the cog rims, and the motion is gaged by the length ofslot h. At the extent of each movement the sleeve is turned, so as tocarry the point of the stop g into the offsets h h', which locks theparts, so that the tool maybe turned vin either position.

Other arrangements of the shaft and adjusting parts might be used toshift the pinion, and the latter might be made to slide up and down on apermanent shaft, the pinion adjusting instead of the shaft. Two pinions,as shown in Fig. 4, might also be employed, engaging, respectively, withthe two rims l 2, the one running free, while the other is locked to thegear, and vice versa, the change being made by any suitable shiftingarrangement.

A boring-instrument provided with the differential gear above describedis very useful, as it is thereby adapted to both slow and rapid work,and the change can be made in a moments time, and without removing thepinion or removing the casing in which the gear rests. It is compact,and the gearing does not occupy any extra space.

A socket may be employed at the end of the shaft for the reception oftools, so that they may be changed at pleasure.

I am aware of the patent to James Smith, dated May 24, 1870, and Idisclaim the construction of drillingmachine therein shown.

Having thus described my invention, I do not claim a boring-instrumentdriven by a crank and gear; nor do I claim a differential gear in whichthe pinion is removed from place by hand to change the motion.

Vhat I claim as new is- 1. The combination, with the stationary casingand revolving cap, havin g the cog-rims of varying diameter, of thevertical shaft, carrying a pinion at its upper end, and capable of avertical adjustment to bring said pinion in gear with either of thecog-rims on the revolvin g cap, as and for the purpose described.

2. The combination of the stationary box C, having the slotted shank D,and the revolving cap a, having the cog-rims 1 and 2 of my name in thepresence of two subscribing varying diameter, With the boring -shaft G,Witnesses.

having the pinion or pinions 3, and the adjusting-sleeve d, saidboring-shaft having a vertical adjustment, substantially as herein de-Witnesses:

scribed, for the purpose specified. R. F. OSGOOD, In Witness whereof Ihave hereunto signed E. B. SCOTT.

JAMES SARGENT.

